| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a motor-generator for a vehicle wherein deterioration in the insulation coating of the field winding of a field winding-type synchronous machine is suppressed and yet the reduction of the size and the weight thereof is feasible. SOLUTION: The motor-generator for a vehicle generates power when an engine is started and a vehicle is an driving. Letting the maximum allowable temperature of a rotor thereof, the maximum attainable temperature during generation that the rotor can attain during generation, the thermal capacity of the rotor, a field current passage time for starting the engine, the electrical resistance of a field winding, and field current be Tmax, Tgmax, Q, T, r, and i, respectively, the field current during generation is limited so that (Tgmax+(imax2.r.T)/Q) is less than Tmax (S112). Thus, a motor-generator for a vehicle is obtained wherein deterioration in the field winding insulating coating of a field winding-type synchronous machine is prevented, and the further reduction in the size and the weight thereof is feasible.</p> |
